)]}'
{
  "commit": "1c59f218cbb78b4ba2875aa675b58aef47e3d951",
  "tree": "b6eaac85413350c088822e9c457c1db1bdf442d2",
  "parents": [
    "3a71c2472b13113e6807ec119bf4367416bb0644"
  ],
  "author": {
    "name": "Clayton Knittel",
    "email": "cknittel@google.com",
    "time": "Fri Nov 06 01:13:31 2026 -0800"
  },
  "committer": {
    "name": "Copybara-Service",
    "email": "copybara-worker@google.com",
    "time": "Fri Nov 06 02:06:43 2026 -0800"
  },
  "message": "Introduce `ClassDataPrefix` for frequently accessed members of `ClassData`\n\nThis is in preparation for a future change which will copy just the `ClassDataPrefix` into the fallback `Container` in `InternalMetadata`. Then, when `InternalMetadata` holds a `ClassData*` instead of an `Arena*`, we can access `ClassDataPrefix` without branching by masking off all the tag bits.\n\nI chose `ClassDataPrefix` to be exactly 32 bytes because this will eventually be a member of `InternalMetadata::Container`, which is already 32 bytes, rounding up to a nice even 64 bytes: `ClassData*` (8 bytes) and `std::string` / `UnknownFieldSet` (24 bytes). We will need to align the fallback `Container` to 64-bytes (since we want 6 tag bits), which for a 64-byte allocation is free with TCMalloc.\n* Note that we have to keep the `ClassData*` member to implement `GetClassData`, which requires the real `ClassData` pointer.\n\nNote that we lose the `ABSL_DCHECK(is_lite)` checks in `reflection_data` and `type_name`, which are non-lite- and lite-only respectively. These `DCHECK`s are sanity checks within proto code, users can\u0027t cause them to fire. I\u0027ve added overloads to both of these methods in `ClassData`, but the `DCHECK`s won\u0027t fire when these methods are called on a `ClassDataPrefix`.\n\nPiperOrigin-RevId: 1015350810\n",
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